US4735176A - Closed evaporative cooling system for an engine - Google Patents

Closed evaporative cooling system for an engine Download PDF

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Publication number
US4735176A
US4735176A US07/045,196 US4519687A US4735176A US 4735176 A US4735176 A US 4735176A US 4519687 A US4519687 A US 4519687A US 4735176 A US4735176 A US 4735176A
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US
United States
Prior art keywords
condenser
engine
upper tank
water jacket
cooling system
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/045,196
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English (en)
Inventor
Tsuyoshi Nishida
Mitsumasa Isoda
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Kubota Corp
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Kubota Corp
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Publication of US4735176A publication Critical patent/US4735176A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P2003/2214—Condensers
    • F01P2003/2228—Condensers of the upflow type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/005—Other engines having horizontal cylinders

Definitions

  • the present invention related to a closed evaporative cooling system for an engine, comprising a condenser for condensing vapor generated in the water jacket of the engine and introduced in the condenser tubes therefrom, by means of heat exchange between the atmosphere and vapor passing in the condenser tubes.
  • a closed evaporative cooling system in which cooling water is evaporated in a water jacket and the vapor is introduced in condenser tubes to be condensed therein, is more advantageous than a circulation cooling system in saving the amount of cooling water by the function of the latent heat of evaporization.
  • the former is disadvantageous in loss of water when the cooling efficiency is low.
  • an improved closed evaporative cooling system for a small horizontal engine disclosed in Japanese Utility Model Publication No. 44-28,022 comprises an auxiliary tank disposed at one side of a condenser, and a pipe communicating the auxiliary tank with an upper tank of the condenser, and a pressure valve fixed at the upper part of the auxiliary tank, so as to cool and condense vapor from the upper tank in the pipe, and to reserve condensed water in the auxiliary tank.
  • the improved system described above may reduce the loss of cooling water as a whole. However, it implies that cooling water will be transfused to the auxiliary tank and decreasing the water in the water jacket for sufficient cooling after a long running of the engine. And the temperature, at which vapor begins to condense in condenser tubes, is depressed by the depression of the internal pressure of the upper tank as a result of the condensation of vapor in the pipe communicating between the two tanks. As a result of depression of the condensation point and internal pressure in the upper tank, vapor begins to condense at the higher position in condenser tubes, and condensed water begins to fall along the internal surface of the tubes.
  • the volume of condensed water in each tube increases as soon as the condensed water begins to fall along the internal periphery of each tube by adsorbing dewdrops of vapor rising therethrough successively, and condensed water closes the internal passages of the tubes at their higher position.
  • water condensed in the tubes may be easily and frequently spit into the upper tank by the pressure of vapor in the water jacket, accompanying small and shocking pulsation of pressure, and the brazed or soldered part between the upper end of each tube and the lower wall of the upper tank is repeatedly and alternatively expanded by heat of vapor and contracted by coolness of water spit therethrough, in such high frequency as three times per a minute, for example. Due to the alternation of expansion and contraction, an alternative thermal stress acts on the brazed or soldered part to bring on the fracture thereof from fatigue of brazing or soldering materials.
  • the primary object of the invention is to prolong the life of the condenser by reducing thermal stress acting on the brazed or soldered part between the upper end of each condenser tube and the bottom plate of the upper tank.
  • the other object of the invention is to reduce the loss of cooling water from the water jacket for a long time.
  • an engine comprising a water jacket having an top opening formed through an upper wall of said engine, a condenser having an upper tank, a bottom plate and condenser tubes, a seat formed around said upside opening for fixing said bottom plate of said condenser thereon, a pressure regulating valve for regulating internal pressure of said upper tank, each of said tube has an upper end penetrating through the bottom wall of said upper tank and brazed or soldered thereto, and a lower end penetrating through said bottom late and brazed or soldered thereto respectively, wherin; the improvement comprises a damper pipe for damping the variation of internal pressure of said upper tank, having one end communicated with said upper tank of said condenser fixed on the upper in the upper part of said water jacket of said engine and another end communicated with said pressure regulating valve.
  • the damper pipe damps the variation of internal pressure of the upper tank, while the mean internal pressure is transmitted to the pressure regulating valve. And the valve is inactive in response to any small and shocking variation or pulsaion of the internal pressure in the tank. Consequntly, the mean internal pressure accumulated in the upper tank is kept higher than that of the known system. As the result, vapor begins to condense at higher temperature and at the lower position in the condenser tubes, so that, condensed water adsorbs only a few amount of dewdrops in vapor before it will fall off from the tubes, and that the volume of condensed water is not grown to close the internal passage of each tube.
  • condensed water is hardly spit into the upper tank and the brazed or soldered part between the upper end of each tube and the lower wall of upper tank does not receive alternative thermal load, so that, the part is prevented from fracture from thermal stress for a long time.
  • condensed water does not close the internal passage of the condenser tubes, and as condensation of vapor occurs at the lower position in each condenser tube, water is returned smoothly and quickly to the water jacket, so that, the loss of cooling water from the water jacket is reduced almost all and the fall of cooling efficiency from the depression of water surface is prevented for a long time.
  • the damper pipe is preferably formed long and narrow, and possiblly, the damper pipe may be provided with a restriction in the way thereof, in order to obtain higher performance in damping.
  • the damper pipe is preferably made of adiabatic nonmetallic materials to prevent condensation of vapor therein.
  • the pressure regulating valve is stuck in closed position by ice of condensed water frozen therein, and that the internal pressure in the condenser is raised to threaten it with damage from abnormal compression therein. Therefore, it is advantageous to dispose the pressure regulating valve on the outer shell, preferably on the upper wall, of the engine so as to transmit the heat generated by the engine to the valve for defrosting of ice therin.
  • FIG. 1 is a vertical sectioned fragmentary side view of a preferred embodiment according to the present invention
  • FIG. 2 is a vertical section of a gas engine with a closed evapolating cooling system according to the present invention
  • FIG. 3 is a perspective detail of a closed evaporative cooling system according to the present invention.
  • FIG. 4 is a vertical sectioned fragmentary side view of a different preferred embodiment according to the present invention, corresponding to the FIG. 1;
  • an engine body E has a crank shaft 1, a crank case 2 which supports the crank shaft 1, a cylinder 4 formed in the crank case 2 at the contrary side of the crank shaft 1, a piston 3 slidably inserted in the cylinder 4, a cilinder head 8 which is provided with an ignition plug 5, a set of intake and exhaust valves 6, and rocker arms 7, fixed to the outside of the cylinder 4.
  • the engine is provided with a flywheel 9 fixed at one end of the crank shaft 1, an air cleaner 10, a muffler 11, and a closed evaporating cooling system C as the accessories.
  • a water jacket 12 is formed around the cylinder 4 in the crank case 2, and communicates with another water jacket 13 formed in the cylinder head 8.
  • the water jacket 12 is open at the upper surface of the crank case 2, and a hollow base member 14, which constitutes part of the upper wall, namely, a part of the outer shell of the engine body E, is fixed on the upper surface of crank case 2 so as to cover this top opening of the crank case 2, and to support a condenser 15 thereon.
  • the bottom wall of the base member 14 is cut at the front side to communicate the interior thereof with the water jacket 12, and the top wall is provided with a top opening 17 at the rear side thereof and a seat 16 for condenser 15, on which the bottom plate 18 of the condenser 15 is fixed, at the top surface thereof around the opening 17, so as to prevent direct invasion of boiling water from the water jacket 12 to the condenser 15, bottom wall of the member 14 functioning as a buffer plate.
  • the system C according to the present invention, further comprises the following elements in addition to the fundamental features described above.
  • a filling port 26 is disposed on the base member 14 and is closed by another pressure regulating valve 27 the pressure setting of which is higher than that of valve 25. And a measuring pipe 28 is positioned under the filling port 26 for setting the level of water in the water jacket 12.
  • the pulsation or variation of internal pressure in the upper tank 20 is damped while mean internal pressure in the upper tank 20 is transmitted to the pressure regulating valve 25 through the pipe 22.
  • the valve 25 is not opened by any small and shocking pulsation of pressure in the upper tank 20, and the mean internal pressure in the upper tank 20 is accurately regulated at the setting pressure of the pressure regulating valve 25. Therefore, a sufficiently high pressure is accumulated in the condenser 15, and the temperature, at which vapor begins to condense, is raised. Cosequently, the condensation efficiency of vapor in the condenser 15 is improved, and the leakage of vapor through the pressure regulating valve 25 is substantially eliminated.
  • the pressure regulating valve 25 communicating with the upper tank 20 of the condenser 15 is supported on the base member 14 at its top surface, so as to transmit heat generated by engine to the valve 25.
  • the damper pipe 22 is extends along the condenser tubes 19 on the side opposite to the fan 21 which sends cooling wind to the condenser 15.
  • the pressure regulating valve 25 is heated by the heat generated by and transmitted from the engine. If the valve is stuck because of ice formed from condensed water therein at the cold start of engine, the ice will be defrosted, and the valve will function normally as soon as the engine becomes warm after its start, before the internal pressure of the condenser is raised by evaporation of cooling water.
  • a pressure regulating valve 25 communicates with the upper tank 20 of the condenser 15 by a damper pipe 22 supported on the top wall of the base member 14 in a depression which is influenced sooner than the higher location of the member 14 by the heat of cooling water and outer shell of the engine 15 body E.
  • the other elements are equivalent to those of the previous embodiment shown in FIGS. 4. And the same result was experienced in the comparative experiments also carried in the same manner as described above.
  • the pressure regulating valve 25 may be defrosted more quickly than the aforementioned system shown in FIG. 4.
  • the damper pipe may be provided with a restriction between the tank 20 and the valve 25.
  • the damper pipe 22 is made of adiabatic non-metallic materials, the inside of the damper pipe 22 is not as chilled by atmosphere that condensation of vapor and depression of pressure may occur therein. Therefore, it is possible to keep the internal pressure of the condenser 15 sufficiently high.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Vibration Prevention Devices (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
US07/045,196 1984-11-14 1987-04-30 Closed evaporative cooling system for an engine Expired - Lifetime US4735176A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59239878A JPS61118522A (ja) 1984-11-14 1984-11-14 横形エンジンのコンデンサ型水冷装置
JP59-239878 1984-11-14

Related Parent Applications (1)

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US06776871 Continuation 1985-09-17

Publications (1)

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US4735176A true US4735176A (en) 1988-04-05

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US07/045,196 Expired - Lifetime US4735176A (en) 1984-11-14 1987-04-30 Closed evaporative cooling system for an engine

Country Status (3)

Country Link
US (1) US4735176A (ja)
JP (1) JPS61118522A (ja)
CN (1) CN1012382B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902551A (zh) * 2021-01-21 2021-06-04 定州康拓科技有限公司 用于生物肥料的冷却装置及其使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107019433A (zh) * 2016-06-12 2017-08-08 中山市尚善电器有限公司 一种升降式锅盖

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658089A (en) * 1921-04-23 1928-02-07 Sue R Mallory Power system
US1709863A (en) * 1925-09-25 1929-04-23 Arthur B Modine Cooling apparatus
US2403218A (en) * 1944-11-24 1946-07-02 Nat Supply Co Cooling system for internalcombustion engines
US2449110A (en) * 1946-11-04 1948-09-14 Le Roi Company Cooling system for internal-combustion engines
US3077927A (en) * 1960-05-02 1963-02-19 Ford Motor Co Cooling system
US3171392A (en) * 1962-03-29 1965-03-02 Magneti Marelli Spa System and related apparatus for the cooling plant of internal combustion engines
US3312204A (en) * 1966-07-28 1967-04-04 Barlow Vapor Cooling Company Internal combustion process and apparatus permitting the use of faster burning fuelsthan are normally used in high-compression automotive gasoline engines
US3499481A (en) * 1969-03-24 1970-03-10 Saf Gard Products Inc Pressurized liquid cooling system
US3820593A (en) * 1970-12-01 1974-06-28 Daimler Benz Ag Installation for venting the cooling liquid of an internal compustionengine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535649A (en) * 1978-09-04 1980-03-12 Terumo Corp Check valve for heparin flow path
JPS5711221U (ja) * 1980-06-25 1982-01-20

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658089A (en) * 1921-04-23 1928-02-07 Sue R Mallory Power system
US1709863A (en) * 1925-09-25 1929-04-23 Arthur B Modine Cooling apparatus
US2403218A (en) * 1944-11-24 1946-07-02 Nat Supply Co Cooling system for internalcombustion engines
US2449110A (en) * 1946-11-04 1948-09-14 Le Roi Company Cooling system for internal-combustion engines
US3077927A (en) * 1960-05-02 1963-02-19 Ford Motor Co Cooling system
US3171392A (en) * 1962-03-29 1965-03-02 Magneti Marelli Spa System and related apparatus for the cooling plant of internal combustion engines
US3312204A (en) * 1966-07-28 1967-04-04 Barlow Vapor Cooling Company Internal combustion process and apparatus permitting the use of faster burning fuelsthan are normally used in high-compression automotive gasoline engines
US3499481A (en) * 1969-03-24 1970-03-10 Saf Gard Products Inc Pressurized liquid cooling system
US3820593A (en) * 1970-12-01 1974-06-28 Daimler Benz Ag Installation for venting the cooling liquid of an internal compustionengine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112902551A (zh) * 2021-01-21 2021-06-04 定州康拓科技有限公司 用于生物肥料的冷却装置及其使用方法

Also Published As

Publication number Publication date
CN85108024A (zh) 1987-05-06
JPH0559247B2 (ja) 1993-08-30
JPS61118522A (ja) 1986-06-05
CN1012382B (zh) 1991-04-17

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